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safe multi-era slashing for NPoS (#3846)

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* define slashing spans

* tests and pruning for slashing-spans record

* validators get slashed before nominators

* apply slash to nominators as well

* chill and end slashing spans

* actually perform slashes

* integration (tests failing)

* prune metadata

* fix compilation

* some tests for slashing and metadata garbage collection

* correctly pass session index to slash handler

* test span-max property for nominators and validators

* test that slashes are summed correctly

* reward value computation

* implement rewarding

* add comment about rewards

* do not adjust slash fraction in offences module

* fix offences tests

* remove unused new_offenders field

* update runtime version

* fix up some docs

* fix some CI failures

* remove no-std incompatible vec! invocation

* try to fix span-max rounding error

* Update srml/staking/src/slashing.rs

Fix type: winow -> window

Co-Authored-By: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

* slashes from prior spans don't kick validator again

* more information for nominators, suppression

* ensure ledger is consistent with itself post-slash

* implement slash out of unlocking funds also

* slashing: create records to be applied after-the-fact

* queue slashes for a few eras later

* method for canceling deferred slashes

* attempt to fix test in CI

* storage migration for `Nominators`

* update node-runtime to use SlashDeferDuration

* adjust migration entry-points somewhat

* fix migration compilation

* add manual Vec import to migration

* enable migrations feature in node-runtime

* bump runtime version

* update to latest master crate renames

* update to use ensure-origin

* Apply suggestions from code review

use `ensure!`

Co-Authored-By: Gavin Wood <gavin@parity.io>

* fix multi-slash removal

* initialize storage version to current in genesis

* add test for version initialization
This commit is contained in:
Robert Habermeier
2019-11-27 20:06:32 +01:00
committed by Gavin Wood
parent de5686509c
commit 4598e13015
13 changed files with 1921 additions and 249 deletions
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substrate/bin/node/runtime/src/lib.rs
+4
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@@ -250,6 +250,7 @@ pallet_staking_reward_curve::build! {
parameter_types! {
pub const SessionsPerEra: sr_staking_primitives::SessionIndex = 6;
pub const BondingDuration: staking::EraIndex = 24 * 28;
pub const SlashDeferDuration: staking::EraIndex = 24 * 7; // 1/4 the bonding duration.
pub const RewardCurve: &'static PiecewiseLinear<'static> = &REWARD_CURVE;
}
@@ -263,6 +264,9 @@ impl staking::Trait for Runtime {
type Reward = (); // rewards are minted from the void
type SessionsPerEra = SessionsPerEra;
type BondingDuration = BondingDuration;
type SlashDeferDuration = SlashDeferDuration;
/// A super-majority of the council can cancel the slash.
type SlashCancelOrigin = collective::EnsureProportionAtLeast<_3, _4, AccountId, CouncilCollective>;
type SessionInterface = Self;
type RewardCurve = RewardCurve;
}